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1 mole of PbS\mathrm{PbS}PbS is oxidised by "X\mathrm{X}X" moles of O3\mathrm{O}_3O3 to get "Y\mathrm{Y}Y" moles of O2\mathrm{O}_2O2. X+Y=\mathrm{X}+\mathrm{Y}=X+Y= _________.
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